The quote from Curtis Sittenfeld's book "Prep" suggests that true interests require solitude and personal reflection. When one is genuinely passionate about a subject, it often leads to moments of introspection and focused exploration, away from the distractions of social interaction.
This idea emphasizes the value of alone time in developing one's interests and understanding the world more deeply. Engaging fully in pursuits often means dedicating time to oneself, highlighting that solitude can be an essential component of personal growth and creativity.